Compress PDF

Reduce PDF file size while maintaining quality

Drop your PDF here

or click to browse. Max file size: 50MB

Compress PDF Online — Free PDF Size Reducer

Skilltosky PDF Tools's free online PDF compressor reduces your PDF file size without sacrificing readability. Choose from multiple quality levels to balance size and visual quality, then download the compressed file instantly — no server upload required.

Step-by-Step Guide

Upload your PDF — Drop your PDF onto the page or click to browse your files.

Choose quality level — Select Low, Medium or High compression depending on how small you need the file.

Compress — Click Compress PDF. The tool re-encodes images in your PDF at the selected quality.

Download — Download the smaller PDF file directly to your device.

Key Features

Multiple Quality Levels

Choose between Low, Medium and High quality to balance file size against visual fidelity.

Image Re-encoding

Embedded images are re-encoded at reduced quality — the main source of PDF file size.

No Server Upload

Compression runs in your browser. Your PDF never leaves your device.

Instant Result

Compressed PDFs are ready to download immediately — no queue, no waiting.

Frequently Asked Questions

How much can I reduce my PDF size?

It depends on the content. PDFs heavy with images can often be reduced by 50–80%. Text-heavy PDFs may show smaller reductions since text compresses efficiently already.

Will compression affect text quality?

No. Text in PDFs is vector-based and is not affected by compression. Only embedded images are re-encoded.

Is there a file size limit?

Because files are processed locally in your browser there is no server-imposed size limit. Very large files may be slower on lower-spec devices.

Can I compress a PDF multiple times?

You can, but repeated compression of already-compressed images yields diminishing returns and may visibly degrade image quality.

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